分类: 物理学 >> 核物理学 提交时间: 2023-09-11
摘要: A trigger system has been designed and implemented for the HIRFL-CSR external target experiment (CEE), the spectrometer for studying nuclear matter properties with heavy ion collisions in the GeV energy region. The system adopts master-slave structure and serial data transmission mode using optical fiber to deal with different types of detectors and long-distance signal transmission. The trigger logic can be accessed based on command register and controlled by a remote computer. The overall field programmable gate array (FPGA) logic can be flexibly reconfigured online to match the physical requirements of the experiment. The trigger system has been tested in beam experiment. It is demonstrated that the trigger system functions correctly and meets the physical requirements of CEE.
分类: 核科学技术 >> 核探测技术与核电子学 提交时间: 2024-05-21
摘要: The cooling storage ring (CSR) external-target experiment (CEE) is a spectrometer used in construction to study the properties of nuclear matter inhigh-baryon density regionsat the Heavy-Ion Research Facility in Lanzhou(HIRFL). This study presentsthe design, simulation, manufacturing,and testingof ahalf-size prototype of amulti-wire drift chamber (MWDC) for the CEE. First, theperformance of the MWDCconnected tohome-made electronics was simulated. The results demonstratedthat an energy resolution of 18.5% for 5.9-keVX-rays and a position resolution of 194 um for protons can be achieved bythe current design. Becausethe size of the largest MWDCreached176× 314 cm, a set of 98× 98 cm prototypes was built using the new techniques. The positioning accuracy of the anode wires inthis prototype exceeded20 um. After optimizationusing commercially available electronicdevices, the prototype achievedan energy resolution of 19.7% for a 55FeX-ray source. The CEE-MWDCdetector and electronics were simultaneouslytested. An energy resolution of 22% was achievedfor the 55Fesource;the track residuals were approximately330 umfor the cosmic rays. The results demonstrate that the current design and techniquesmeet the requirementsof the CEE-MWDCarray.
分类: 物理学 >> 核物理学 提交时间: 2023-07-08
摘要: The HIRFL-CSR external-target experiment (CEE) under construction is expected to provide novel opportunities to the studies of the thermodynamic properties, namely the equation of state of nuclear matter (nEOS) with heavy ion collisions at a few hundreds MeV/u beam energies. Based on Geant 4 packages, the fast simulations of the detector responses to the collision events generated using transport model are conducted. The overall performance of CEE, including spatial resolution of hits, momentum resolution of tracks and particle identification ability has been investigated. Various observables proposed to probe the nEOS, such as the production of light clusters, $\rm t/^3He$ yield ratio, the radial flow, $\pi^{-}/\pi^{+}$ yield ratio and the neutral kaon yields, have been reconstructed. The feasibility of studying nEOS beyond the saturation density via the aforementioned observables to be measured with CEE has been demonstrated.